2 Equivalent circuit ■ Assumption – Both stator and rotor have 3-phase Y connected windings – The staotr is fed from a 3-phase source – The subscript “1” refers to the stator and “2” to the rotor ■ Stand still condition – Suppose the rotor is at stand still (stationary rotor ϖ m =0). Using transformer theory, the eq circuit for 1 phase to ground